/*********************************************************************
 * Copyright (C) 2002 Andrew Khan
 * <p>
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * <p>
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * <p>
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ***************************************************************************/

package jxl.read.biff;

/**
 * Helper to convert an RK number into a double or an integer
 */
final class RKHelper {
    /**
     * Private constructor to prevent instantiation
     */
    private RKHelper() {
    }

    /**
     * Converts excel's internal RK format into a double value
     *
     * @param rk the rk number in bits
     * @return the double representation
     */
    public static double getDouble(int rk) {
        if ((rk & 0x02) != 0) {
            int intval = rk >> 2;

            double value = intval;
            if ((rk & 0x01) != 0) {
                value /= 100;
            }

            return value;
        } else {
            long valbits = (rk & 0xfffffffc);
            valbits <<= 32;
            double value = Double.longBitsToDouble(valbits);

            if ((rk & 0x01) != 0) {
                value /= 100;
            }

            return value;
        }
    }
}


